Originally Posted by
lemoyne
In those temperatures all you have to do is set it in front of the car heater then take it back out in the cold and you will have moisture in the barrel in and out of any warm area will do it.
Any amount of moisture in the back of the powder or in the BP will cause the problems you describe with any powder.
Lee, I would say that it certainly "could" cause a problem, but doesn't mean that it will. After what I did with my rifle 2yrs ago...I'm not concerned with that at all anymore. You couldn't create any more moisture than I did, short of pouring water down in the barrel. I had 2 knight mk-85's that were in and out of extreme temp swings, (one probably 30+ times on avg 50 degree temp change) and both fired off like I just loaded them...two months later.
Why, I'm not sure... it certainly goes against all conventional thinking.